Original Upload Date feature?

Is it possible to implement a feature to list the original upload date of the image when the original author uploaded it? Can't this be automated, especially, if it's from Pixiv?
It's useful for sorting through images from an artist chronologically, since many times, older images are uploaded after newer images

I'd especially appreciate this, since my use of "tn" Dtext for metadata has been contentious. However, I'd then worry about: regionally adjusted timestamps (compared to UTC); images that are identical among various upload sources (and so, slightly different upload times); and images that were made, even posted, earlier, but had to be reuploaded at a later date (this most often being apparent in source commentaries).

Is ordering (descending/ascending) by pixiv ID enough, or are you more hoping for the actual dates?

Actual dates would have an advantage over Pixiv IDs in that they would also work for posts from other sites.

Not every source has an upload date, though. If it's not specified manually, such images would be displayed either before everything or dead last. Also, filling up the dates retroactively can be rather hard.

It's hard as hell to fill in the BPM manually for every song in my music collection, and I'll never get done, but it's still cool that the field is there in the metadata. I don't think anyone is proposing that this should become the default sort order.

edit: Then again, no one is going to vandalize my local music library's BPM fields, and vandalism of this data would be especially hard to spot.

In lieu of the original date (for example, bad_id and sourceless posts) maybe the sort could use the upload-to-Danbooru date instead.